A poisson distribution is the probability distribution that result from a poisson experiment.It deals with counting the number of occurrence of a particular event in a specific time interval or region of space. It is used in pratice where there are in frequent occuring event with respect to time, volume similar units area, etc.

                The binomial distribution is determined by two parameters "p" and "n". In a number of cases "p" (the probability of sucess) may happen to be very small (even less then 0.01) and the "n" (the no. of tribals) is large enough (like more than 50), so that their product "np" remains a constant, the situation  is termed as "Poisson Distribution", and it gives an approximation for bionial probability distribution formula, i.e,

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